MissingValueInterface
extends
ValueInterface
in
This models a missing value
Table of Contents
- getRawValue() : string|int|float|bool|array<string|int, mixed>|null|DateTimeInterface
- isSystemMissing() : bool
Methods
getRawValue()
public
getRawValue() : string|int|float|bool|array<string|int, mixed>|null|DateTimeInterface
Return values
string|int|float|bool|array<string|int, mixed>|null|DateTimeInterface —isSystemMissing()
public
isSystemMissing() : bool
Return values
bool —Whether the value is a system or a user missing value A user missing value is an answer option like don't know, a system missing value can occur when the system decides to not show a specific question to a user. For variables that are not related to questions this should always be true.